This knowledge is based not on a poll of scientists (science does not work that way), or a on a "hunch," it is based on knowledge of the fundamental physics that causes climate change, in response to changes in the concentration of greenhouse gases in the atmosphere.

Climate models, which describe all of our understanding of atmospheric physics can only simulate the observed global warming with the presence of human-derived greenhouse gases. This knowledge is not new, but has been evolving and tested since the mid-19th century. Science knows no politics, and to suggest that it progresses with political influence is to denigrate the hard work and dedication of tens of thousands of women and men who dedicate their lives working to contribute to human welfare and economic prosperity through pursuit of knowledge and understanding through science.

There is a fallacy and grave omission in the national discussion that regulation only has costs that hurt industry. All regulation is in fact designed to protect people and property. As an example, the economic benefit/cost ratio of the U.S. Clean Air Act has been calculated by the Government Accountability Office to be 30 to 1.

Those who suggest that the United States invest in renewable energy are not just arguing for the environment, they are simultaneously arguing for investment in the future economic vitality of our country. Let's embrace science, and live in a fact-based country.

Paul Shepson

Vienna, Virginia

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